It's a good story although somewhat done to death over the years. What is the score so far? Two major movies, Three or Four TV adaptations?
I'm enjoying this latest effort although I feel the whole thing descends into the realm of the rediculous every time a Triffid comes into shot.
Come on Guys, come up with a convincing Triffid, you've surely had enough practice at it by now.
Personally I think it is "the walking/shuffling" that lets them down. I think a static plant that can propagate like wildfire via windbourne spores, with the ability to establish itself almost anywhere, lamp posts, walls etc, a bit like Ivy does. Rather than a whip lash I think a dart might be a better vehicle for the sting.